The spontaneous kit ligand; steel (KitlSl) mutation behaves in a semidominant fashion causing deficiencies in pigment cells, germ cells, and blood cells.
|Allele Type||Gene Symbol||Gene Name|
|Not Applicable||Ahr||aryl-hydrocarbon receptor|
|Allele Type||Gene Symbol||Gene Name|
|Allele Type||Gene Symbol||Gene Name|
|Spontaneous||Pde6b||phosphodiesterase 6B, cGMP, rod receptor, beta polypeptide|
This strain is homozygous for the retinal degeneration allele Pde6brd1. See article "Genetic Background Effects: Can Your Mice See?", JAX® NOTES Spring 2002, No. 485.
The multiple steel mutations (KitlSl) behave in a semidominant fashion and cause deficiencies in pigment cells, germ cells, and blood cells paralleling those caused by the Kit locus mutations (dominant spotting alleles). Most of the alleles at steel locus cause severe anemia in utero and death by 15 to 16 days of gestation in homozygous mutant mice. However, compounds of two steel mutants (e.g. KitlSl/KitlSl-d) are viable, black-eyed white, are usually sterile in one or both sexes, and have severe macrocytic anemia. Heterozygous steel mice have a diluted coat color with a small amount of white spotting, are viable and fertile, and may have a slight macrocytic anemia. Primordial germ cells are absent in the nonviable steel homozygotes and severely reduced in steel heterozygotes. Mast cells are virtually absent in skin and other tissues of steel mutant mice. Tumors tend to develop in germ-cell-deficient ovaries with advancing age.
Inbreeding started in 1948 from a heterozygous KitlW / + stock (same origin as the WB/ReJ strain). Kitlsl (steel) mutation backcrossed to strain WB-+/+. Now maintained as a congenic strain for Kitlsl.
|Allele Name||d variant|
|Allele Type||Not Applicable|
|Allele Synonym(s)||Ahd; Ahk; AhRd; Ahhn; ah; in|
|Gene Symbol and Name||Ahr, aryl-hydrocarbon receptor|
|Gene Synonym(s)||Ah; Ah; Ahh; Ahh; Ahre; Ahre; In; In; aromatic hydrocarbon responsiveness; aryl hydrocarbon hydroxylase; bHLHe76; dioxin receptor; inflammatory reactivity|
|Strain of Origin||Not Applicable|
|General Note|| |
Strain of origin - this allele was found in DBA/2J, AKR/J, 129, SWR, RF, NZB strains
|Molecular Note||This allele encodes a 104 kDa receptor that is stabilized by molybdate and has an affinity for ligand 10-100 fold lower than that of the receptor produced by the C57BL/6J allele. PCR sequencing of cDNA revealed ten nucleotide differences between the coding sequences of the DBA/2J and C57BL/6J receptors. Five of the ten differences would cause amino acid changes. One of these, an apparent T to C transition replaces the opal termination codon in the C57BL/6J allele with an arginine codon in the DBA/2J allele. This change would extend translation of the DBA/2J mRNA by 43 amino acids, accounting for the larger size of the peptide produced by this allele (104 kDa vs 95 kDa for the C57BL/6J allele). A second T to C transition changes a leucine codon in the C57BL/6J allele to a proline codon in the DBA/2J allele, and would likely change secondary structure of the peptide and thus ligand affinity.|
|Allele Synonym(s)||MgfSl; Sl|
|Gene Symbol and Name||Kitl, kit ligand|
|Gene Synonym(s)||Clo; Con; DCUA; FPH2; FPHH; Gb; Gb; KL-1; MGF; Mgf; Mgf; SCF; SF; SHEP7; SLF; Sl; Sl; Steel; Steel factor; blaze; blz; blz; cloud gray; contrasted; grizzle-belly; grizzle-belly; mast cell growth factor; steel; stem cell factor|
|Strain of Origin||C3H|
|Molecular Note||By Southern blotting, it was concluded that this allele contains a deletion encompassing most, if not all, of the coding region of the gene. A probe corresponding to nucleotides 6 to 685 of the cDNA failed to hybridize to DNA obtained from embryos homozygous for this allele. PCR analysis with primers for sequences at various distances from the Kit gene narrowed the 5' and 3' deletion endpoints to a 350 and a 380 base-pair region, respectively. Sequencing of the product of PCR using primers designed to span the deletion revealed that it extends through 973,366 base pairs on Chromosome 10 between nucleotide positions 99,177,807 and 100,151,173 (NCBI Map Viewer, Build 36.1), with a 4-base pair insertion joining the deletion endpoints, and contains 6 predicted and 3 known genes.|
|Allele Name||retinal degeneration 1|
|Allele Synonym(s)||Pdebrd1; rd; rd-1; rd1; rodless retina|
|Gene Symbol and Name||Pde6b, phosphodiesterase 6B, cGMP, rod receptor, beta polypeptide|
|Gene Synonym(s)||CSNB3; CSNBAD2; PDEB; Pdeb; Pdeb; RP40; nmf137; phosphodiesterase, cGMP, rod receptor, beta polypeptide; r; r; rd; rd; rd-1; rd1; rd1; rd10; rd10; retinal degeneration; retinal degeneration 1; retinal degeneration 10|
|Strain of Origin||various|
|General Note||The following inbred strains are known to be homozygous for Pde6b |
|Molecular Note||Two mutations have been identified in rd1 mice. A murine leukimia virus (Xmv-28) insertion in reverse orientation in intron 1 is found in all mouse strains with the rd1 phenotype. Further, a nonsense mutation (C to A transversion) in codon 347 that results in a truncation eliminating more than half of the predicted encoded protein, including the catalytic domain has also been identified in all rd1 strains of mice. A specific degradation of mutant transcript during or after pre-mRNA splicing is suggested.|
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